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Production process

Production process

Sandvik's rolling mill for rock drill steel for the manufacturing of top-hammer rock drill rods is the most up-to-date in the world. This unique mill is fully automated and designed specifically for manufacturing this one product.

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After rolling in the billet mill, the rods are turned to avoid decarburization in the final rolling process. A long, straight center hole is drilled in the drill steel blank and a core is inserted in the hole before heating the blank. The blanks are hot-rolled into round or hexagon-shaped drill steel.

A carefully controlled cooling process after rolling guarantees uniform mechanical properties. The core is removed and, after the finishing operations, the drill steel is ready for shipment.